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    <script src="../bootstrap-5.1.3-dist/js/bootstrap.js"></script>
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<body class="container">
    <h3 align="center">字体的粗细和斜体效果</h3>
    <p class="fw-bolder">双双新燕飞春岸，片片轻鸥落晚沙。（fw-bolder）</p>
    <p class="fw-bold">惜霜蟾照夜云天，朦胧影画勾阑（fw-bold）</p>
    <p class="fw-normal">惜霜蟾照夜云天，朦胧影画勾阑（fw-normal）</p>
    <p class="fw-light">独惜霜蟾照夜云天，朦胧影画勾阑（fw-light）</p>
    <p class="fw-lighter">惜霜蟾照夜云天，朦胧影画勾阑（fw-lighter）</p>
    <p class="fst-italic">惜霜蟾照夜云天，朦胧影画勾阑（fst-italic）</p>
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